Commands by Abiden (11)

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prevent large files from being cached in memory (backups!)
We all know... $ nice -n19 for low CPU priority.   $ ionice -c3 for low I/O priority.   nocache can be useful in related scenarios, when we operate on very large files just a single time, e.g. a backup job. It advises the kernel that no caching is required for the involved files, so our current file cache is not erased, potentially decreasing performance on other, more typical file I/O, e.g. on a desktop.   http://askubuntu.com/questions/122857 https://github.com/Feh/nocache http://packages.debian.org/search?keywords=nocache http://packages.ubuntu.com/search?keywords=nocache   To undo caching of a single file in hindsight, you can do $ cachedel   To check the cache status of a file, do $ cachestats

Remove empty directories
You can also use, $ find . -depth -type d -exec rmdir {} \; 2>/dev/null

Count to 65535 in binary (for no apparent reason)
Yes, it's useless.

Function to split a string into an array

Sort a character string
Sorts a character string, using common shell commands.

remove recursively all txt files with number of lines less than 10

Show what PID is listening on port 80 on Linux

check open ports without netstat or lsof

Get your public ip using dyndns

validate json
I have this saved as jsonlint chmodded +x and file.js is instead $1, but YMMV


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